Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb60cc669d1f863…

MALICIOUS

PDF

71.3 KB Created: 2021-03-24 17:52:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d485a8b7f857cb7518c73475a726babd SHA-1: 68df95e3f9c4463897abc531989e569814b23073 SHA-256: 2bb60cc669d1f863578751686ca5ae5fa5f10f87f35637779cddf11feef4f3af
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers as malicious. It contains numerous embedded URLs, many pointing to disposable hosting or suspicious domains, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying a link farm on disposable hosting, suggesting an effort to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mezovuduw.ru/wix?keyword=mortal+kombat+karnage+combos PDF link annotation
    • https://cdn.sqhk.co/jebavimot/whijgid/music_billboard_top_100_albums.pdfIn PDF document text
    • https://cdn.sqhk.co/jobiwokojo/UFc2bFx/60_seconds_atomic_adventure_ios_review.pdfIn PDF document text
    • http://govitus.sportsontheweb.net/debt_acknowledgement_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421335/normal_6052e821966fc.pdfIn PDF document text
    • http://mscredit.info/900239202862xzfw.pdfIn PDF document text
    • https://cdn.sqhk.co/pasezateda/bjh7jgE/wajuvepofolunutolewovaro.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/ibYhege/58882763680.pdfIn PDF document text
    • https://cdn.sqhk.co/jugomuzuteb/ifhcjaK/spelling_mastery_level_e_student_workbook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379471/normal_602c5d765640b.pdfIn PDF document text
    • http://talemine.getenjoyment.net/english_grammar_and_composition_class_8_solutions.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/ZgeX3hb/klondike_solitaire-_msn_games-_free_online_games.pdfIn PDF document text
    • http://arendaavto.taxi/63091371253qy2an.pdfIn PDF document text
    • https://cdn.sqhk.co/gofelaxes/gBllUhc/benetton_f1_cars.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/labubibamerenevevega.pdfIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/ar_15_sling_for_hunting.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/416_cat_backhoe_fuel_pump.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/fizufewu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E6 5328 bytes
SHA-256: 3365a0ba7fac718f31b554759618efbf42aa2695da8bd1e567ae439286ea0327
font_01_sfnt_off0000e800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE800 11388 bytes
SHA-256: 18f14fbf5f4d0eb1e368eec57594c07e5da01bbcd7537c44ef86653e89a5d7ec

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